Ben Rosenfield is an American actor and musician. He is best known for playing Willie Thompson on the fourth and fifth seasons of HBO's period crime drama series Boardwalk Empire (2013–2014). He starred in leading roles in Greetings from Tim Buckley (2012), Affluenza (2014), and 6 Years (2016) as well as supporting roles in Song One (2014), Indignation (2016), Person to Person (2017), and Mickey and the Bear (2019).

Boardwalk Empire is an American period crime drama television series created by Terence Winter and broadcast on the premium cable channel HBO. The series is set chiefly in Atlantic City, New Jersey, during the Prohibition era of the 1920s and stars Steve Buscemi as Nucky Thompson. Winter, a Primetime Emmy Award-winning screenwriter and producer, created the show, inspired by Nelson Johnson's 2002 non-fiction book Boardwalk Empire: The Birth, High Times, and Corruption of Atlantic City, about the historical criminal kingpin Enoch L. Johnson.